When I stack up 3 overlapping images... the image that should be the 2nd / middle layer according to the z-order actually shows at the bottom of the stack.
I tested a variety of options / configurations... and noticed that when I up the layer to 6 total images... it's layer / level 3 that drops down to the bottom.
Here's a 6 layer sample... http://goto.marlincreek.com/layers/
It's just a bunch of black / blue sqr jpgs layed on top of each other.
Code
<plugin name="layer1"
url="black_sq.jpg"
z-order="100"
origin="center" x="" y=""
width="700" height="500"
alpha="0.7"
onhover="showtext(layer 1);"
/>
<plugin name="layer2"
url="blue_sq.jpg"
z-order="102"
origin="center" x="" y=""
width="600" height="400"
alpha="0.7"
onhover="showtext(layer 2);"
/>
<plugin name="layer3"
url="black_sq.jpg"
z-order="104"
origin="center" x="" y=""
width="500" height="300"
alpha="0.7"
onhover="showtext(layer 3);"
/>
<plugin name="layer4"
url="blue_sq.jpg"
z-order="106"
origin="center" x="" y=""
width="400" height="200"
alpha="0.7"
onhover="showtext(layer 4);"
/>
<plugin name="layer5"
url="black_sq.jpg"
z-order="108"
origin="center" x="" y=""
width="300" height="100"
alpha="0.7"
onhover="showtext(layer 5);"
/>
<plugin name="layer6"
url="blue_sq.jpg"
z-order="110"
origin="center" x="" y=""
width="200" height="50"
alpha="0.7"
onhover="showtext(layer 6);"
/>
Display More
I've tried reverting back to version 1.0.7 to see where a bug might have shown up... but it's the same from 1.0.7 to the current version.